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We propose a scotogenic scenario where the singlet-doublet dark matter plays an important role in generating Dirac neutrino mass. It is possible to address muon anomalous magnetic moment with charged doublet in the loop. Due to the Dirac nature of neutrino, the additional right-handed neutrino (RHN) can contribute to the additional relativistic degrees of freedom, \(\varDelta N \textrm{eff}\) , in the Universe. We show that the tiny Dirac neutrino mass correlates the parameter space of muon \((g-2)\) , \(\varDelta N \textrm{eff}\) and plays a non-trivial role in deciding the relic density of dark matter. We analyse the thermal dark matter and its detection prospects. We also explored thermal and non-thermal origin of \(\varDelta N \textrm{eff}\) and the parameter space, explored in this work, is verifiable at future CMB experiments like CMB-S4 and SPT-3G.

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An Approach to Dirac Neutrino Mass with Singlet-Doublet Dark Matter and \(\varDelta N \textrm{eff}\)

  • 会议论文

  • 发表日期：

    2025年

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  • Sujit Kumar Sahoo

摘要

We propose a scotogenic scenario where the singlet-doublet dark matter plays an important role in generating Dirac neutrino mass. It is possible to address muon anomalous magnetic moment with charged doublet in the loop. Due to the Dirac nature of neutrino, the additional right-handed neutrino (RHN) can contribute to the additional relativistic degrees of freedom, \(\varDelta N \textrm{eff}\) , in the Universe. We show that the tiny Dirac neutrino mass correlates the parameter space of muon \((g-2)\) , \(\varDelta N \textrm{eff}\) and plays a non-trivial role in deciding the relic density of dark matter. We analyse the thermal dark matter and its detection prospects. We also explored thermal and non-thermal origin of \(\varDelta N \textrm{eff}\) and the parameter space, explored in this work, is verifiable at future CMB experiments like CMB-S4 and SPT-3G.